.clearfix() {
    *zoom:1;
    &:after {
        display:block;
        content:"";
        width:0;
        height:0;
        font-size:0;
        clear:both;
        visibility:hidden;
        overflow:hidden;
    }
}

// Sizing shortcuts
.size(@width, @height) {
    width: @width;
    height: @height;
}

.square(@size) {
    .size(@size, @size);
}

.padding-vertical(@padding) {
    padding-left: @padding;
    padding-right: @padding;
}

.padding-horizontal(@padding) {
    padding-top: @padding;
    padding-bottom: @padding;
}

.margin-vertical(@margin) {
    margin-left: @margin;
    margin-right: @margin;
}

.margin-horizontal(@margin) {
    margin-top: @margin;
    margin-bottom: @margin;
}

.text-overflow() {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.hide-text() {
    font: 0/0 a;
    color: transparent;
    text-shadow: none;
    background-color: transparent;
    border: 0;
}

// Box sizing
.box-sizing(@boxmodel) {
    -webkit-box-sizing: @boxmodel;
    -moz-box-sizing: @boxmodel;
    -ms-box-sizing: @boxmodel;
    box-sizing: @boxmodel;
}

// User select
.user-select(@select) {
    -webkit-user-select: @select;
    -moz-user-select: @select;
    -ms-user-select: @select;
    -o-user-select: @select;
    user-select: @select;
}

// Border Radius
.border-radius(@radius) {
    -webkit-border-radius: @radius;
    -moz-border-radius: @radius;
    border-radius: @radius;
}

// background-size
.background-size(@size) {
    -webkit-background-size: @size;
    -moz-background-size: @size;
    background-size: @size;
}

// Single Corner Border Radius
.border-top-left-radius(@radius) {
    -webkit-border-top-left-radius: @radius;
    -moz-border-radius-topleft: @radius;
    border-top-left-radius: @radius;
}
.border-top-right-radius(@radius) {
    -webkit-border-top-right-radius: @radius;
    -moz-border-radius-topright: @radius;
    border-top-right-radius: @radius;
}
.border-bottom-right-radius(@radius) {
    -webkit-border-bottom-right-radius: @radius;
    -moz-border-radius-bottomright: @radius;
    border-bottom-right-radius: @radius;
}
.border-bottom-left-radius(@radius) {
    -webkit-border-bottom-left-radius: @radius;
    -moz-border-radius-bottomleft: @radius;
    border-bottom-left-radius: @radius;
}

// Single Side Border Radius
.border-top-radius(@radius) {
    .border-top-right-radius(@radius);
    .border-top-left-radius(@radius);
}
.border-right-radius(@radius) {
    .border-top-right-radius(@radius);
    .border-bottom-right-radius(@radius);
}
.border-bottom-radius(@radius) {
    .border-bottom-right-radius(@radius);
    .border-bottom-left-radius(@radius);
}
.border-left-radius(@radius) {
    .border-top-left-radius(@radius);
    .border-bottom-left-radius(@radius);
}

// Drop shadows
.box-shadow(@shadow) {
    -webkit-box-shadow: @shadow;
    -moz-box-shadow: @shadow;
    box-shadow: @shadow;
}

// Transitions
.transition(@transition) {
    -webkit-transition: @transition;
    -moz-transition: @transition;
    -o-transition: @transition;
    transition: @transition;
}
.transition-delay(@transition-delay) {
    -webkit-transition-delay: @transition-delay;
    -moz-transition-delay: @transition-delay;
    -o-transition-delay: @transition-delay;
    transition-delay: @transition-delay;
}
.transition-duration(@transition-duration) {
    -webkit-transition-duration: @transition-duration;
    -moz-transition-duration: @transition-duration;
    -o-transition-duration: @transition-duration;
    transition-duration: @transition-duration;
}

// Transformations
.rotate(@degrees) {
    -webkit-transform: rotate(@degrees);
    -moz-transform: rotate(@degrees);
    -ms-transform: rotate(@degrees);
    -o-transform: rotate(@degrees);
    transform: rotate(@degrees);
}
.scale(@ratio) {
    -webkit-transform: scale(@ratio);
    -moz-transform: scale(@ratio);
    -ms-transform: scale(@ratio);
    -o-transform: scale(@ratio);
    transform: scale(@ratio);
}
.translate(@x, @y) {
    -webkit-transform: translate(@x, @y);
    -moz-transform: translate(@x, @y);
    -ms-transform: translate(@x, @y);
    -o-transform: translate(@x, @y);
    transform: translate(@x, @y);
}
.skew(@x, @y) {
    -webkit-transform: skew(@x, @y);
    -moz-transform: skew(@x, @y);
    -ms-transform: skewX(@x) skewY(@y); // See https://github.com/twitter/bootstrap/issues/4885
    -o-transform: skew(@x, @y);
    transform: skew(@x, @y);
    -webkit-backface-visibility: hidden; // See https://github.com/twitter/bootstrap/issues/5319
}
.translate3d(@x, @y, @z) {
    -webkit-transform: translate3d(@x, @y, @z);
    -moz-transform: translate3d(@x, @y, @z);
    -o-transform: translate3d(@x, @y, @z);
    transform: translate3d(@x, @y, @z);
}

// Gradients
#gradient {
    .horizontal(@startColor: #555, @endColor: #333) {
        background-color: @endColor;
        background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
        background-image: -webkit-gradient(linear, 0 0, 100% 0, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
        background-image: -webkit-linear-gradient(left, @startColor, @endColor); // Safari 5.1+, Chrome 10+
        background-image: -o-linear-gradient(left, @startColor, @endColor); // Opera 11.10
        background-image: linear-gradient(to right, @startColor, @endColor); // Standard, IE10
        background-repeat: repeat-x;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor),argb(@endColor))); // IE9 and down
    }
    .vertical(@startColor: #555, @endColor: #333) {
        background-color: mix(@startColor, @endColor, 60%);
        background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
        background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
        background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
        background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
        background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
        background-repeat: repeat-x;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down
    }
    .directional(@startColor: #555, @endColor: #333, @deg: 45deg) {
        background-color: @endColor;
        background-repeat: repeat-x;
        background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
        background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
        background-image: -o-linear-gradient(@deg, @startColor, @endColor); // Opera 11.10
        background-image: linear-gradient(@deg, @startColor, @endColor); // Standard, IE10
    }
    .horizontal-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
        background-color: mix(@midColor, @endColor, 80%);
        background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
        background-image: -webkit-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
        background-image: -moz-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
        background-image: -o-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
        background-image: linear-gradient(to right, @startColor, @midColor @colorStop, @endColor);
        background-repeat: no-repeat;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
    }

    .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
        background-color: mix(@midColor, @endColor, 80%);
        background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
        background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
        background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
        background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
        background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
        background-repeat: no-repeat;
        filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
    }
    .radial(@innerColor: #555, @outerColor: #333) {
        background-color: @outerColor;
        background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@innerColor), to(@outerColor));
        background-image: -webkit-radial-gradient(circle, @innerColor, @outerColor);
        background-image: -moz-radial-gradient(circle, @innerColor, @outerColor);
        background-image: -o-radial-gradient(circle, @innerColor, @outerColor);
        background-repeat: no-repeat;
    }
    .striped(@color: #555, @angle: 45deg) {
        background-color: @color;
        background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, rgba(255,255,255,.15)), color-stop(.25, transparent), color-stop(.5, transparent), color-stop(.5, rgba(255,255,255,.15)), color-stop(.75, rgba(255,255,255,.15)), color-stop(.75, transparent), to(transparent));
        background-image: -webkit-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
        background-image: -moz-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
        background-image: -o-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
        background-image: linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
    }
}

// Backface visibility
// Prevent browsers from flickering when using CSS 3D transforms.
// Default value is `visible`, but can be changed to `hidden
// See git pull https://github.com/dannykeane/bootstrap.git backface-visibility for examples
.backface-visibility(@visibility){
    -webkit-backface-visibility: @visibility;
    -moz-backface-visibility: @visibility;
    backface-visibility: @visibility;
}

// Opacity
.opacity(@opacity) {
    opacity: @opacity / 100;
    filter: ~"alpha(opacity=@{opacity})";
}
